Qubit transformations on Rashba ring with periodic potentialKregar, Ambrož (Avtor) Ramšak, Anton (Avtor) quantum mechanicsqubit transformationsquantum ringsRashba couplingperiodic potentialA spin-qubit transformation protocol is proposed for an electron in a mesoscopic quantum ring with tunable Rashba interaction controlled by the external electric field. The dynamics of an electron driven around the ring by a series of Landau–Zenner-like transitions between a finite number of local voltage gates is determined analytically. General single-qubit transformations are demonstrated to be feasible in a dynamical basis of localized pseudo-spin states. It is also demonstrated that by the use of suitable protocols based on changes of the Rashba interaction full Bloch sphere can be covered. The challenges of a possible realization of the proposed system in semiconductor heterostructures are discussed.20202021-07-19 15:29:14Članek v reviji128560sl